BIOMOLECULES AND ENZYMES

Detailed explanation-1: -These are water-insoluble proteins. Example – keratin (present in hair, wool, and silk) and myosin (present in muscles), etc.

Detailed explanation-2: --keratin is a fibrous structural protein, meaning it is made up of amino acids that form a repeating secondary structure. The secondary structure of -keratin is very similar to that of a traditional protein -helix and forms a coiled coil.

Detailed explanation-3: -The keratins represent the largest branch within the super-family of intermediate-filament (IF) proteins. Keratins are grouped into two families termed as type I and type II keratins based on their sequence homology.

Detailed explanation-4: -In fact, the association of helices into coiled-coil structures like keratin is an example of quaternary structure, and the left-handed superhelical twist of this association gives keratin an extra measure of tensile strength appropriate for this fibrous, structural protein.

Detailed explanation-5: -The most common types of secondary structures are the helix and the pleated sheet. Both structures are held in shape by hydrogen bonds, which form between the carbonyl O of one amino acid and the amino H of another.